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US 12,753,818 B2Granted
Spiral spring device
AssigneeHayamizu Hatsujo Co., Ltd.
InventorKazumasa Iida
Life of this patent
Estimating the term…
Abstract
Provided is a spiral spring device that increases the rotational range of the rotary shaft of an apparatus, that secures the strength of the rotary shaft, and that makes the functional components to be more easily housed inside of the rotary shaft, in which an inner end of a spiral spring is coupled to a shaft, and an outer end of the spiral spring is coupled to a sub shaft that is different from the shaft of the apparatus. The inner end of the spiral spring is shaped to follow the outline of the shaft to be coupled to the shaft by tightening.
Claims6
A spiral spring device, comprising:
- an inner end of a spiral spring is coupled to a shaft of an apparatus, the shaft rotates in forward and reverse directions;
- and an outer end of the spiral spring is coupled to a member different from the shaft of the apparatus;
- wherein the inner end of the spiral spring is formed into a shape that follows the outline of the shaft to be coupled to the shaft by tightening;
- wherein when the shaft rotates in the forward direction, the inner end follows in the forward rotation and the spiral spring is wound tight to accumulate torque;
- wherein when the shaft rotates in the reverse direction for a distance of a certain area, the inner end follows the reverse rotation, and the spiral spring is unwound by the reverse rotation of the shaft;
- and
- when the shaft rotates in the reverse direction more than the distance of a certain area, and the torque accumulated by the spiral spring is released and the shaft runs idle.
4 more elements
Dependencies are inferred from the claim text.